Staging: rtl8188eu: core: rtw_pwrctrl.c: Fix a comparision warning.

Move the constant to the right side of comparision.
Issue found by checkpatch.pl semantic patch results for rtw_ap.c

WARNING:Comparision should place the constant on the right side of the
test.

Signed-off-by: Sanjana Sanikommu <sanjana99reddy99@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>